Why was this feature change committed without any pre-commit discussion
at all? It has since been questioned a few times in IRC.

IMO it's not obvious that this is an improvement - it can be useful to
see the list of tags that Rockbox supports, and which ones are missing
on a particular file. So that screen serves two purposes - to see what
the tags are, and to see what tags are missing.

I'm not saying that I'm completely against it, but I definitely think
these kinds of changes shouldn't be made without any discussion.